For a bone marrow transplant from an unrelated donor to succeed, the donor and recipient must match on 6 out of 6 genetic traits used in tissue typing.

It told these groups that it had private donors who wanted to make gifts anonymously and that the donors would match the funds the charitable organizations put up.

In turn, private donors match each boy's savings and provide counseling and turoring support for a five-year period.

In 2007, the school was challenged to build a school through Free The Children and an anonymous donor would match up to $7000 of funds raised.

The donor will match anything they raise above the $5 million, up to $10 million.

The donor will match anything above the $2 million.

As part of the private funding component, an anonymous donor matched dollar-for-dollar all gifts and commitments for the Clough Commons up to a maximum of $8.75 million.

An unidentified corporate donor matched that amount for a total donation of around $8,000.

They also agree to contribute a fixed portion of their earnings to a special fund, which the donors match.

The second donor must match the first recipient to complete the pair exchange.